Reasoning steps: Chalcedonian and miaphysite wording

Verdicts: S16 · Chalcedonian and miaphysite wording. Shared notes and post-750 development: christology.

S16.1: The natures formula

Step S16.1.1: Scripture

John 1:14; Phil 2:6–8; Col 2:9. Scripture teaches one subject who is fully God and fully man (see F04.1), but it uses neither ’nature’ formula. The choice between them is not a Scripture question.

Step S16.1.2: Patristic evidence

Chalcedon (451): ‘in two natures, unconfusedly, immutably, indivisibly, inseparably’. Leo: ’each form does what is proper to it with the co-operation of the other’. Cyril’s anathemas at Ephesus (431) and Severus: ‘one nature of God the Word incarnate’; Severus rejects Leo’s letter as ‘impious’. Sources: chalcedon-chr-s1 · leo-the-great-chr-s1 · severus-of-antioch-chr-s1 · severus-of-antioch-chr-s2 · ephesus-chr-s1.

Step S16.1.3: Weighing decision

Both formulas are Era III–IV and both claim Cyril. Each confesses full deity, full humanity, and no mixture; each rejects Eutyches and Nestorius. The patristic witness is split, so neither side scores above 3 on the formula.

• Confidence: Medium.

Step S16.1.4: Source-proximity weighing

• Scripture (benchmark): Not decided by Scripture (not a Scripture question).
• Assessment: Era III–IV only; no Era I–II evidence uses either formula.

S16.1 by tradition

• Catholic, Orthodox (3): Chalcedon received.
• Oriental Orthodox (3): Severus’s Cyrilline formula (verified).
• Lutheran (3): AC III and FC VIII receive Chalcedon’s two natures.
• Anglican (3): Art. II: ’two whole and perfect Natures’.
• Presbyterian (3): WCF VIII.2. Reformed Baptist (3): 1689 8.2. General Baptist (3): Orthodox Creed (to verify).
• Anabaptist: not assessed; the confessions do not use either formula.

S16.2 (was christology/X2): One or two wills and operations in Christ

Step S16.2.1: Scripture

Luke 22:42: ’not my will, but yours, be done’. John 6:38: ’not to do my own will but the will of him who sent me’. A human will distinct from, and submitted to, the Father’s will.

Step S16.2.2: Patristic evidence

Gregory (T3) insists on a full human mind. Leo: ’each form does what is proper to it with the co-operation of the other’. Severus rejects this operations language. Constantinople III (T4): ’two natural wills, and two natural operations’, not opposed. Sources: gregory-nazianzen-chr-s1 · leo-the-great-chr-s1 · severus-of-antioch-chr-s2 · constantinople-iii-chr-s1.

Step S16.2.3: Weighing decision

Reading A: one will (Severus’s one operation; later monothelites). Reading B: two natural wills in harmony. B is chosen. Gregory’s ’not assumed, not healed’ principle requires a human will, and Gethsemane shows a human willing submitted to the Father. A rests on T4 polemic against Leo.

• Confidence: Medium–high.

Step S16.2.4: Source-proximity weighing

• Scripture (benchmark): Gethsemane (Luke 22:42) and John 6:38 show a human will distinct from and submitted to the Father’s. (Scripture confidence: medium-high)
• Assessment: The formula is T4 (681), but Scripture and Gregory (T3) support it. The one-operation position lacks biblical support.